6-10 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013
log.
Comfort Alert Descriptions Cause E2 Advisory
Long Run Time Compressor is running
extremely long run cycles (typi
-
cally more than 18 hours).
Low refrigerant charge.
Evaporator blower is not running.
Evaporator coil is frozen.
Faulty metering device
Condenser coil is dirty
Thermostat is malfunctioning
Compressor Second Stage Cooling Wiring
Compressor run time is long
System Pressure
Trip
Discharge or pressure out of
limits or compressor over-
loaded.
High head pressure.
Condenser coil poor air circulation (dirty, blocked,
damaged)
Condenser fan is not running
Return air duct has substantial leakage.
System pressure trip
Short Cycling Compressor is running only
briefly.
Thermostat demand signal is intermittent.
Time delay relay or control board is defective.
If high pressure switch present, check if there is a
System Pressure Trip problem.
Compressor short cycling
Locked Rotor Locked rotor. Run capacitor has failed.
Low line voltage (contact utility if voltage at dis-
connect is low).
Excessive liquid refrigerant in compressor.
Compressor bearings have seized.
Locked Rotor Trip
Open Circuit Compressor open circuit. Outdoor unit power disconnect is open.
Compressor circuit breaker or fuse(s) is open.
Compressor contactor has failed open.
High pressure switch is open and requires manual
reset.
Open circuit in compressor supply wiring or con-
nections.
Unusually long compressor protector reset time
due to extreme ambient temperature.
Compressor windings are damaged.
Compressor open circuit
Open Start Circuit Compressor current only in run
circuit.
Run capacitor has failed
Open circuit in compressor start wiring or connec-
tions.
Compressor start winding is damaged.
Compressor open start circuit
Open Run Circuit Compressor current only in start
circuit.
Open circuit in compressor run wiring or connec-
tions.
Compressor run winding is damaged.
Compressor open run circuit
Table 6-6 -Comfort Alert Outputs
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